W.B Civil Service Examination (Main)- 2000
(Optional Papers)
Botany Paper-II
Time Allowed-3 Hours Full Marks-100
Group - A
Answer any three questions
1. Answer any five questions :
(a) What is Photolysis ? What is its role in NADPH+ formation ?
(b) What is RUDP ? At what stage of plant life is it formed ?
(c) Define dormancy and quiscence. What are the main causes of seed dormancy ?
(d) What is phytochrome ? What is its chemical nature ?
(e) Name the processes by which atmospheric gases are continuously reduced by plants.
(f) Name the principal steps of protein synthesis in higher plants. 4 x 5
2. Answer any five questions :
(a) What is the medicinal use of Swertia Chirata ? What is the common habitat of the plant ?
(b) Name a fibre yielding plant mentioning the agroclimatic condition suitable for its growth.
(c) Where and why is Anacardium Occidental cultivated ?
(d) Name the parts that have economic use of Carthamustinctorius indicating the weather suitable for its cultivation.
(c) Name an edible Fern. Where does it grow ?
(f) Name a pteridophyte that has medicinal importance. Where does this plant grow ? 4 x 5
3. Answer any five questions :
(a) What is gentic code ? What is its applicability ?
(b) What is incomplete genome increase ? Explain with suitable example.
(c) Outline the principles of embryo culture technique.
(d) How is selection practised in crop improvement programme ?
(e) What is Threestrand double crossing ?
(f) What is Epistasis ? Give example of Dominant recessive gene epistasis ? 4 x 5
4. Answer any five questions :
(a) What are Auxin and Gibbcrellin ? How do they differ functionally ?
(b) What are the functions of Florigen and Abscissic Acid ?
(c) What is the difference between first meiotic division and second meiotic division ?
(d) What is DNA ? What is its relation with heredity ?
(e) Name the plant growth substance which is used as a herbicide.
(f) What is greenhouse effect ? 4 x 5
5. Answer any five questions :
(a) Indicate the impact of deforestation on ecosystem.
(b) What are the major sources, nature and effect of water pollutants ?
(c) What is plant succession ? Name the stages of succession in a hydrosere.
(d) What is algal bloom ? What is its ecological significance ?
(c) What is meant by plant community ? How does it originate in a particular area ?
(f) Name some adaptive features of plants growing in Sundarban area. 4 x 5
Group - B
Answer any two questions
6. Answer any five questions :
(a) What is respiratory quotient ? How does it differ in cases of Carbohydrate, fat and protein substrates ?
(b) Give the scientific name of the plant - the flame of the forest. Why is it commonly planted ?
(c) Name two organisms which can convert N2 to NH3
(d) How drug adulteration can be detected ?
(e) Why plants cannot survive anaerobically for a long time ?
(f) How many ATP molecules ar obtained from one turn of TCA cycle ? 4 x 5
7. Indicate with suitable example (any five) :
(a) How plants give out excess of water in a liquid form ;
(b) How plants survive under xerophytic condition ;
(c) How angiospermic total parasite gets nutrition ;
(d) How symbiotic plants get along well ;
(e) How epiphytic aerial plant gets nutrition ;
(f) How saprophytic angiosperm receives nutrition. 4 x 5
8. Answer any five questions :
(a) Why is glycolysis called an oxidative process ?
(b) What are obligate anaerobes ? How do they respire ?
(c) Why is transpiration called a "Necessary evil" ?
(d) What are mutants ? What are the different forms of mutant species ?
(e) What are the basic differences between prokaryotic and enkaryotic cells ?
(f) What is plant migration ? Name the factors responsible for plant migration. 4 x 5
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